Furnace



' A. G. FELTON.

(No Model.)

FURNACE.

Patented Feb. 7,1882.

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l l l NITED/ STATES PATENT OFFICE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 253,191, dated February 7, 1 882.

l Application filed May 26, 1881. (No model.)

To all whom it may concern Be it known that I, ALEXANDER 0.,FELTON, of Warwick,county of Franklin, State of sachusetts, have invented an Improvement in Furnaces, of which the following description, inconnectionwith theaccompanyingdrawings, is a specification.

My invention relates to furnaces, and is shown embodied in a furnace constructed on the same general principle and with the same object as the one described in aformer application filed by me August 25, 1880, to which reference may be had. In the said application a furnace was shown having a bottom or floor grate and vertical gratings extended upward therefrom on all four sides of the furnace, which was rectangular in shape, and above the said vertical grating the side walls, offire-brick or masonry, were inclined inward toward the center ofthe furnace to diminish the pressure of the fuel against them. Dampers were employed to control the admission of air to the vertical gratin gs, and a portion of the grate-bars were properly constructed to enable them to be removed for the purpose of withdrawing the fuel. In my present invention I have dispensed with the saiddam pers, and make the vertical or upright grate-bars tapering or broader at the upper than at their lower ends, so as to reduce the spacefor admission of air between them toward the upper part of the furnace, I having found by experiment that such distribution of the air or draft produces greatlyimproved results. The furnace-linin g above the said vertical grates is provided in mypresent invention with numerous small air-passages, and the said lining may or may not be inclined inward as in my former invention, as in most cases the employment of these air-passages is sufficient to prevent the formation of clinkers upon the surface of the said furnace-linin g.

Theinvention further consists in a novel construction of the floor-grating, by which it may be readilylowered or turned aside as a whole or in large sections to permit the withdrawal of the fuel without necessitating the removal and replacing the separate grate-bars.

Figure 1 is a longitudinal section of a portion of a furnace provided with my improvements; and Fig. 2 a transverse sectional detail thereof on line a: 00, Fig. 1, further illustrating the construction of the bottom or horizontal gratin g. 1

The fire-chamber a, provided with a fuel-supply opening, b, and the ashpit 0, below the said chamber, have the same general arrangement in relation to one another as in my former application. The floor-grating ot' the said firech'amber consists of grate-bars d (1, provided with perforated lugs 0 near their extremities, through which are inserted rods ff, by which the said grate-bars are held together, the rods f being supported in notches 2, formed in the upper portion of projecting wings g on the main bearing-bar g, extended across the middle of the furnace, which thus forms the support for one end of said bars and enables them all to be turned upon the said bars f as ahin ge. The other end of the grate-bars d in the rear portion of the furnace is supported on a bearing-bar, h, as there generally will be no 'necessity for moving these grate-bars. One or more of the grate-bars d in the front portion of the furnace extend forward beyond the end of the rest of the grate-bars, as shown at 3, and are supported by suitable links or hooks,'i, to which access can be had through small doorsjin the front of the ash-pit, to enable the said hooks to be disengaged from the said grate-bars, and thus allow the whole front portion of the grate bars (1 to swing down to the position shown in dotted lines, Fig. 1, to permit the fuel to fall into the ash-pit.

A sufficient number of the bars at are supported on the hooks i to properly sustain the weight of the fuel above, and the rest of the bars receive their support from these through the rodf, which thus performs the function of a bearing-bar.

If desired, the bars (1 at the rear of the furnace may be supported similarly to those at the front; but-this will not usually be advantageous.

The vertical bars k are supported in suitable,

The side walls, m, of the furnace, above the vertical grate-bars 7c, are made of refractory material and provided with small perforations 6, for the admission of air through them into the fire, the said perforated passages being connected with an air-space, 7 left between the said refractory material and the masonry of the furnace, in continuation of the space 4, behind the vertical grate-bars 7c, the said space 7 decreasing in width from its bottom to its top.

I claim-,

1. In a furnace, the combination of the bottom or-floor grating with upright gratings the bars of which are tapered from end to end in their thickness, measured parallel with the wall ofthe furnace that they constitute, to afford a variable amount of space for the passage of air between them, as and for the purpose set forth.

2. The series of grate-bars connected together to form a continuous grating, and strung or mounted atone end upon arod pivoted and supported on asuitablebearing-bar, combined with a removable support for the other end of the said grate-bars, whereby the entire connected grating may be permitted to turn on the pi\'- oted rod to remove the fire or fuel from the furnace, substantially as described.

3. In a furnace, the following elements in combination: the bottom or floor grate, the upright gratings on all sides thereof, the perforated refractory lining'above'the said upright gratings, and a continuous air-passage behind the said upright grating and refractory lining, substantially as described.

4. The main bearing-bar provided with. 

